Transcription of Chapter 3 Chemical Reactions - Texas A&M University
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Chapter 3 Chemical Reactions - Texas A&M University
Chapter 3 Chemical Reactions PRACTICING SKILLS Balancing Equations Balancing equations can be a matter of running in cir cles if a reasonable methodology is not employed. While th ere isn't one right place to begin, g enerally you will suffer fewer complications if you begin the b alancing process using a substance th at contains the g reatest number of elements or the largest subscript values. Noting th at you must h ave at least th at many atoms of each elemen t involved, co efficients can be used to increase the "atomic inventory". In the nex t few questions, you will see one emboldened substance in each equation. This embold ened substan ce is the one that I judge to be a good starting place. One last hint--modify th e coefficients of uncombin ed elements, those not in compounds, after you modify the coefficien ts for compounds containing those elemen ts -- not before!
Reactants: sodium nitrate and sulfuric acid Products: sodium sulfate and nitric acid [....although nitric acid typically exists as an aqueous solution.] (d) NiCO3(s) + 2 HNO3(aq) Ni(NO3)2(aq) + CO2(g) + H2O(l) 1. Note the need for at least 1 Ni atom on both sides. This inventory will mandate 2 NO3 groups on the right—and also on the left.
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